Setting the idles and fuel/air ratio

I can't remember for sure but turning the headlights on while doing the idle adjustments sounds kind of familiar. I feel like I've read that in the service manual but I didn't do it because my headlights didn't make a difference in my idle speed.

Before you added the relays, your lights would be dimmer during idle and they would get brighter when you hit the gas right? Now with the relays they stay bright whether your idling or in the gas? That could be why you see a bigger fluctuation in your idle speed but that's just a guess on my part. I don't have the replays so I wont notice it because by time my lights are getting brighter, I'm already on the gas and idling doesn't come into play anymore.

I would turn on your A/C and headlights when doing your idle adjustment. If you don't and you adjust your idle as low as possible, the car could possibly die at a stop if you happened to have your A/C and/or headlights on. How much does each thing drop your idle? If you do the adjustment with them on, then obviously your idle will raise a little bit when neither one is on but you'd rather be idling 50rpm or so high than 50rpm low. 50 high is barely noticeable, 50 low could be the difference in the engine stalling or not.